外围带咔唑基的联苯桥联二聚对苯乙烯撑的双光子吸收性能  

Two Photon Absorption Property of a PPV Oligomer with Central Biphenyl Bridge and Peripheral Carbazole Substituents

作　　者：金佳科[1] 宋学良[1] 李寒莹[1] 汪茫[1] 孙景志[1] 

机构地区：[1]浙江大学高分子科学与工程学系,大分子合成与功能构筑教育部重点实验室,杭州310027

出　　处：《高等学校化学学报》2009年第3期573-576,共4页Chemical Journal of Chinese Universities

基　　金：国家自然科学基金(批准号:50573065,90101008)资助

摘　　要：报道了十字形结构对荧光生色团的双光子吸收(TPA)作用横截面积的影响.1,4-二(9′-乙基咔唑基)-3′-乙烯基苯(R1)是经典的具有D-π-D结构的TPA生色团.通过一个联苯桥将两个双光吸引(TPA)链连接在一起得到的十字形分子(1)显示出比单链分子明显增大的双光子吸收作用横截面积(σ′).在10-4mol/L的甲苯溶液中,十字结构分子1的σ′值为491.0×10-50cm4.s,而R1的σ′值仅为137.5×10-50cm4.s.σ′的放大可以归结为十字结构使TPA生色团的偶极呈交叉排列,抑制了浓溶液中的荧光猝灭.The effect of cruciform structure on the two photon absorption action cross-section of fluorescence chromophore was reported. 1,4-Di（9＇-ethyl-carbazolyl）-3＇-vinylbenzene （R1） is a classic two photon absorp- tion（TPA） chromophore with D-π-D structure. By linking two TPA chains with a biphenyl bridge, the ob- tained cruciform molecule （1） exhibits evidently larger two photon absorption action cross-section （σ＇） than its single-chain counterpart. For example, in 10^-4 mol/L toluene solution, cruciform 1 shows a σ＇ value of 491.0 × 10^-50 cm^4 ·s, while the σ＇ value of R1 is only 137.5 × 10^-50 cm^4 ·s. The amplification of σ＇ was ascribed to the cruciform structure, which rendered the TPA chromophores with cross dipole arrangement and curbed the fluorescence quenching in concentrated solutions.

关 键 词：双光子吸收 横截面积 荧光效率 十字结构 

分 类 号：O644[理学—物理化学]